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Elan Coil [88]
3 years ago
8

a boy runs from his house to school at speed 5m/s on a straight road and returns with speed of 10m/s.The distance between the ho

use and school is 100m. Find his average velocity.... with explaination please​
Physics
1 answer:
CaHeK987 [17]3 years ago
3 0

Explanation:

time spent to run from house to school=100/5=20s

time spent to return from school=100/10=10s

average velocity=200m/(10+20)

  • =6.66m/s
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Answer:

X₃₁ = 0.58 m  and  X₃₂ = -1.38 m

Explanation:

For this exercise we use Newton's second law where the force is the Coulomb force

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        F₁₃ = F₂₃

Since all charges are of the same sign, forces are repulsive

        F₁₃ = k q₁ q₃ / r₁₃²

        F₂₃ = k q₂ q₃ / r₂₃²

Let's find the distances

         r₁₃ = x₃- 0

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We substitute

      k q q / x₃² = k 4q q / (2-x₃)²

      q² (2 - x₃)² = 4 q² x₃²

        4- 4x₃ + x₃² = 4 x₃²

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We solve the quadratic equation

        x₃ = [-4 ±√(16 - 4 5 (-4)) ] / 2  5

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A sound that is perceived as twice as loud requires
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So, For greater mass kinetic energy will be greater and for smaller mass kinetic energy will be smaller.

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